• Pollution
(OECD) : the introduction by
humans directly or
indirectly, of substances or energy into the environment resulting in deleterious effects of such a nature as to endanger human health, harm living resources or interfere with amenities or other legitimate use of the environment.
• The chemical substances are generally toxins which have detrimental effects on the biological functions of an organism.
• The science that
looks into these toxic effects is
called toxicology.